TY - GEN
T1 -
Investigation of interactions in a simulated geologic CO
2
/rock minerals system for CO
2
underground sequestration
AU - Lin, H.
AU - Fujii, T.
AU - Takisawa, R.
AU - Hashida, Toshiyuki
PY - 2007/5/11
Y1 - 2007/5/11
N2 -
In this study, laboratory supercritical fluid CO
2
-rock interactions experiments were conducted in a Hastelloy C-276 hydrothermal autoclave apparatus at 100 °C and a CO
2
pressure of 10 MPa. The dissolution characteristics of rock minerals and their surface texture alternation after CO
2
treatment were carefully examined by ICP-AES, GC/MASS and SEM/EDX investigation, respectively. The results showed that Si element was present in the treated scCO
2
fluid, and its concentration increased with the increasing reaction time. In addition, a high C content film deposit-like carbon was found to be present on the treated quartz surface. These suggested that a minute quantity of water in the form of porewater or vapor and reactive Hastelloy C in the autoclave should be mainly responsible for the dissolution of quartz into scCO
2
fluid and the formation of carbon deposit on the quartz surface. High catalysis of Hastelloy C also contributed to a significant reduction among CO
2
, H
2
O and rock minerals to produce some organics, such as some organic silicon compounds that could dissolve in the sCO
2
fluids. Consequently, a long-term investigation on the interactions between CO
2
and rock minerals should be requisite for evaluation of safety and feasibility of geologic CO
2
sequestration.
AB -
In this study, laboratory supercritical fluid CO
2
-rock interactions experiments were conducted in a Hastelloy C-276 hydrothermal autoclave apparatus at 100 °C and a CO
2
pressure of 10 MPa. The dissolution characteristics of rock minerals and their surface texture alternation after CO
2
treatment were carefully examined by ICP-AES, GC/MASS and SEM/EDX investigation, respectively. The results showed that Si element was present in the treated scCO
2
fluid, and its concentration increased with the increasing reaction time. In addition, a high C content film deposit-like carbon was found to be present on the treated quartz surface. These suggested that a minute quantity of water in the form of porewater or vapor and reactive Hastelloy C in the autoclave should be mainly responsible for the dissolution of quartz into scCO
2
fluid and the formation of carbon deposit on the quartz surface. High catalysis of Hastelloy C also contributed to a significant reduction among CO
2
, H
2
O and rock minerals to produce some organics, such as some organic silicon compounds that could dissolve in the sCO
2
fluids. Consequently, a long-term investigation on the interactions between CO
2
and rock minerals should be requisite for evaluation of safety and feasibility of geologic CO
2
sequestration.
KW - C0 sequestration
KW - Catalysis of hastelloy C
KW - ScC0 -rock Interactions
KW - Water or vapor
UR - http://www.scopus.com/inward/record.url?scp=34248204279&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34248204279&partnerID=8YFLogxK
U2 - 10.1063/1.2721242
DO - 10.1063/1.2721242
M3 - Conference contribution
AN - SCOPUS:34248204279
SN - 0735404038
SN - 9780735404038
T3 - AIP Conference Proceedings
SP - 17
EP - 21
BT - WATER DYANMICS
T2 - 4th International Workshop on Water Dynamics
Y2 - 7 November 2006 through 8 November 2006
ER -